Nut-lock.



No. 733,754. I PATENTED JULY 14, 1903.

W TNE E j V INVEN a wwmmmm 72 i W tion whereby a nut may be securelylooked a side elevation of a bolt and nut thereonin NlTED STATESPatented July 14, 1953.

PATENT OFFICE.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 733,754, dated July 14,1903.

Application filed April 20, 1903.

To all whom it may concern:

Be it known that I, PETER C. Simon, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented certain new and useful Improvements inNut-Locks, of which the following is a specification.

My invention relates to nut-locks, the object of my invention being toprovide means which shall be cheap and simple in construc on a bolt toprevent the unscrewing thereof. Myinvention therefore resides in thenovel construction, combination, and arrangement of parts for the aboveends, hereinafter fully specified, and particularly pointed out in theclaims.

In the accompanying drawings, Figure 1 is the position in which the nutis locked on the bolt. Fig. 2 is a cross-section thereof on the line A Aof Fig. 1 lookingtoward the nut. Fig. 3 is an enlarged detail of part ofFig. 1. Fig. 4 is a view similar to Fig. 1, showing the parts in theposition in which the nut is advancing and before it is locked on thebolt. Fig. 5 is a cross-section on the line B B of Fig. 4 looking towardthe nut. Fig. 6 is an enlarged detail of part of Fig. 4. Fig. 7 is alongitudinal section of the bolt and nut. Fig. 8 is an end View of thesame. Fig. 9 is a detail perspective view of the key. Fig. 10 is asimilar View of the spring.

Referring to the drawings, 1 represents the bolt having the head 2 andthe screw-threads 3. At the screw-threaded end said bolt has alongitudinal groove or trough 4., partly closed at the end, as shown at5, in which is placed the sliding key 6. Said key has on its. uppersurface as it rests in the groove threads or ribs 7, which are-at thesame distance apart as the threads of the bolt and the forward ends ofwhich have the same pitch as the threads of the bolt, so that whenbrought into register therewith they form continuations of the same; butthe rear ends are cut away or sloped back slightly toward the head ofthe bolt, as shown at 8. The end of the key 6 next the head of the boltis reduced in size to form a stem 9, around which is a coiled spring 10,which presses against the end of the groove and the end of the shoulderof the key ,nut, as before.

Serial No. 153,386. (No model.)

from which said stem extends. By this means the key is normally pressedby the spring away from the head of the bolt, so that its outer endpresses against the partly closed end 5 of the groove. In this positionthe rear portions of the short threads or ribs 7 on the key are inalinement with the threads of the bolt on the rear side of the groove,as shown in Fig. 1.

The not has one or more longitudinal grooves 11 cut in its innersurface. In the present instance I have shown three such grooves, sothat the nut will be looked after each turn through one-third of arevolution. If it is desired to lock the nut atterasmaller angularmovement, more of such grooves will be provided. If aftera larger, thenfewer will be provided; These grooves are-cut to the depth of the threador slightly deeper, leaving shoulders 12 at the ends of the threadswhere they are cut through. When the nut has been turned so that theforward edge of one of said grooves 11 in the nut has passed the slidingkey, then the threads of said key finding no resistance to longitudinalmovement the key can slide toward the nut under the action of the spring10, so thatits end abuts against the partly-closed end 5 of the groove.

In this position the forward ends of the short threads or ribs of thesliding key are out of alinementwith the ends of the threads at thefront edge of the groove and are in line with the shoulders on thethreads of the nut, so that they form abutments for said shoulders,preventing the nut from turningrearwardly. When the nut is now advanced,the shoulders of the threads in the nut at the rear side of the groovecan pass into the depressions :between the threads or ribs of thesliding key on account of said threads or ribs being slanted backward attheir rear portions toward the head of the bolt. The forward movement ofthe nut will cause the sliding key to slide inward toward the'bolt-headagainst the action of the spring until the groove in the nut is againexactly over the sliding key, when the sliding key will slide outwardunder the action of the spring and will lock the To remove the nut, anysmall narrow instrument, such as a small nail or nail-punch, is pushedthrough the opening between the end of the groove and the nut againstthe end of the sliding key, pushing said sliding key inward against theaction of the spring into its unlocking position. While itis so held insaid unlocking position the nut can be unscrewed and taken oif the bolt.

I claim-- 1. In a device of the character described, the combination ofa bolt having a longitudinal groove, a key movable in said groove havingon its upper surface threads or ribs at the same distance apart as thethreads of the bolt, the rear ends of said threads or ribs being cutaway toward the head of the bolt, and a nut having a longitudinal groovethrough its threads, whereby after the nut has been screwed onto thebolt the shoulders of the threads of the nut may be brought intoalinement with the shoulders of the threads of the sliding key, thelatter then forming abutments, substantially as described.

2. In a device of the character described,

the combination of a bolt having a longituv dinal groove, a key movablein said groove having on its uppersurface threads or ribs at the samedistance apart as the threads of the bolt, the rear ends of said threadsor ribs being cutaway toward the head of the bolt, and a nut having alongitudinal groove through its threads, whereby after the nut has beenscrewed onto the bolt the shoulders of the threads of the nut may bebrought into alinement with the shoulders of the threads of the slidingkey, the latter then form abutments, and a spring for normally bringingthe shoulders of the nut-threads int-o alinernent with the shoulders ofthe key-threads, substantially as described.

In Witness whereof I have hereunto set my hand in the presence of twosubscribing wit- IIGSSGS.

P. C. SEOOR. Witnesses:

FRANCIS M. WRIGHT,

,ussm GORFINKEL.

